21038270 has 24 divisors (see below), whose sum is σ = 41626872. Its totient is φ = 7649840.

The previous prime is 21038267. The next prime is 21038273. The reversal of 21038270 is 7283012.

It is an interprime number because it is at equal distance from previous prime (21038267) and next prime (21038273).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21038273) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7484 + ... + 9903.

It is an arithmetic number, because the mean of its divisors is an integer number (1734453).

Almost surely, 2^21038270 is an apocalyptic number.

21038270 is a deficient number, since it is larger than the sum of its proper divisors (20588602).

21038270 is a wasteful number, since it uses less digits than its factorization.

21038270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17416 (or 17405 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 21038270 is about 4586.7493936338. The cubic root of 21038270 is about 276.0599096301.

The spelling of 21038270 in words is "twenty-one million, thirty-eight thousand, two hundred seventy".